高一英语译林牛津版必修2(安徽适用)同步课件unit 1 tales of the unexplained section Ⅰ welcome to the unit,reading
高一英语译林牛津版必修2(安徽适用)同步课件unit 1 tales of the unexplained section Ⅰ welcome to the unit,reading第3页

 In one experiment,the researchers took all 200 items that Rico is supposed to know and divided them into 20 groups of 10 objects.Then the owner told the dog to go and fetch one of the items and bring it back.In four tests,Rico got 37 out of 40 commands right.As the dog couldn't see anyone to get clues,the scientists believe Rico must understand the meanings of certain words.